Yeah, I knew this folding already, but to make an airplane instead. You just do the same thing and before step 7, you stick the strip of paper that you had removed at first to make the sheet square (the one we have to ignore at step 2) inside the model. And this model looks nice and flies well. Well... and you also have to fold it a bit better than on these pics... it has to be at least somewhat symmetric if you want it to fly.

Nice instructable, but you need to make it clear that you're using a square of paper (and how you made it square), plus step 4 would be easier if you turned the paper over between steps 2 and 3. Mine flew first go, though it needs a little tweaking on the wing-tips to fly straight.